local M = {}

M._augroup = nil

---Whether autoformatting is enabled.
---@return boolean
local is_enabled = function() return M._augroup ~= nil end

---Disable autoformatting.
M.disable = function()
  if not is_enabled() then return end
  vim.api.nvim_del_augroup_by_id(M._augroup)
  M._augroup = nil
end

---Enable autoformatting.
M.enable = function()
  if is_enabled() then return end

  local ok, formatter = pcall(require, "formatter.format")
  if not ok then
    vim.notify("formatter.nvim not installed!", vim.log.levels.ERROR)
    return
  end

  M._augroup = vim.api.nvim_create_augroup("fschauen.autoformat", { clear = true })
  vim.api.nvim_create_autocmd("BufWritePost", {
    desc = "Format files on write.",
    group = M._augroup,
    pattern = "*",
    callback = function() formatter.format("", nil, 1, vim.fn.line("$")) end,
  })
end

---Toggle autoformatting.
M.toggle = function()
  if is_enabled() then
    M.disable()
  else
    M.enable()
  end
end

---Crate a lualine component that shows an icon when autoformatting is enabled.
---@return table component
M.lualine = function()
  local icon = require("fschauen.util.icons").ui.Format
  return {
    function() return icon end,
    cond = is_enabled,
  }
end

return M